Vehicle Battery Management System Shutdown Mode Current Drain
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Solution Overview
Problem
Electric vehicles experience battery drain due to leakage current when electrical subsystems remain operational after the vehicle is turned off, which can lead to inefficient battery performance and reduced service life.
Innovation Solution
A vehicle battery management system (BMS) that initiates a timer when the vehicle is turned off, storing data and switching the battery to a shutdown mode to limit current to 1 mA or less, and reactivates when the vehicle is turned back on, allowing for efficient battery management and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical subsystems remain operational after the vehicle is turned off, then monitoring and control functions are maintained, but battery current drain increases to 13 mA-4 mA
Solution Approach 1:
The BMS enters a standby mode before complete shutdown, pre-positioning the system to maintain minimal monitoring functions while reducing power consumption. This preliminary state allows the system to quickly resume full operation when needed while avoiding the high current drain of fully operational subsystems
Solution Approach 2:
The system changes operational parameters by transitioning from a fully operational state to a standby mode, where current draw is reduced from 13 mA-4 mA to 1 mA or less. This parameter change maintains essential monitoring capabilities while dramatically reducing energy loss
2Loss of energy
If the BMS enters shutdown mode to limit current to 1 mA or less, then battery energy conservation is improved, but the ability to respond quickly to vehicle activation may be delayed
Solution Approach 1:
The BMS performs preliminary actions by maintaining a standby state with essential functions partially active before complete shutdown. This allows the system to be in a ready state that requires minimal energy while still capable of rapid response to activation signals
Solution Approach 2:
The system extracts only the essential monitoring and control functions needed for safety and operation, separating them from non-essential subsystems. This extraction allows the BMS to maintain critical capabilities at minimal power consumption levels while eliminating unnecessary current drain
Data Source
AI summary
Vehicle battery management systems (BMS) and methods are described, in which the output of a vehicle battery is reduced by activating a shutdown mode. A BMS may be configured to start a timer when the vehicle is turned off, e.g. based on when the main power between the vehicle and the battery is interrupted or based on a signal from the vehicle control system. The BMS may further be configured to store BMS data (e.g. variable data related to operation and/or status of the battery) to an electronic storage device, and to switch the battery to a shutdown mode, when the timer reaches a predetermined value. The BMS may be further configured to load the BMS data from the electronic storage device and/or to deactivate the shutdown mode when the vehicle is turned back on.